The list includes 46 Tory MPs. Tory MPs are highlighted in blue. The emboldened names were the first six signatories. [New names in CAPS including people who have since said they will support the motion.]

Here's a reminder of the motion due to be discussed on Thursday 27th OctoberMonday 24th October:

"The House calls upon the Government to introduce a Bill in the next session of Parliament to provide for the holding of a national referendum on whether the United Kingdom

(a) should remain a member of the European Union on the current terms;

(b) leave the European Union; or

(c) re-negotiate the terms of its membership in order to create a new relationship based on trade and co-operation."

Steve Baker

JOHN BARON

ANDREW BINGHAM

Mr Brian Binley

BOB BLACKMAN

Mr Peter Bone

Graham Brady

Andrew Bridgen

DAN BYLES

Mr Gregory Campbell

RONNIE CAMPBELL

Mr Douglas Carswell

Mr William Cash

Mr Christopher Chope

Mr James Clappison

Tracey Crouch

JOHN CRYER

David T. C. Davies

Philip Davies

Mr David Davis

NICK DE BOIS

Caroline Dinenage

Mr Nigel Dodds

JEFFREY DONALDSON

Nadine Dorries

Richard Drax

Frank Field

Mr Mark Field

Zac Goldsmith

Mr James Gray

CHRIS HEATON-HARRIS

Gordon Henderson

Kate Hoey

GEORGE HOLLINGBERY

Mr Philip Hollobone

Kelvin Hopkins

STEWART JACKSON

Mr Bernard Jenkin

CHRIS KELLY

Mr Edward Leigh

Dr Julian Lewis

Mr Ian Liddell-Grainger

Mrs Anne Main

Karl McCartney

Jason McCartney

Dr William McCrea

JOHN MCDONNELL

PATRICK MERCER

Nigel Mills

Austin Mitchell

Anne Marie Morris

STEPHEN MOSLEY

DAVID MOWAT

SHERYL MURRAY

CAROLINE NOAKES

David Nuttall

MATTHEW OFFORD

Ian Paisley

Priti Patel

Andrew Percy

Mark Pritchard

Mark Reckless

Mr John Redwood

JACOB REES-MOGG

Mr Laurence Robertson

Andrew Rosindell

Jim Shannon

Mr Richard Shepherd

David Simpson

Henry Smith

Mr Mark Spencer

Bob Stewart

GARY STREETER

GRAHAM STRINGER

GISELA STUART

JULIAN STURDY

JUSTIN TOMLINSON

Mr Andrew Turner

Keith Vaz

Martin Vickers

MIKE WEATHERLEY

Heather Wheeler

Craig Whittaker

JOHN WHITTINGDALE

Sammy Wilson

Dr SARAH WOLLASTON

Please email tim@conservativehome.com if you know of other names we should add to this list.

Paul Goodman examines the internal Conservative politics of the motion over at ToryDiary.